Characterization of Staggered Twin Formation in HCP Magnesium

Characterization of Staggered Twin Formation in HCP Magnesium
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HCP 镁中交错孪晶形成的表征

DOI:
10.1007/978-3-030-05789-3_31
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发表时间:
2019
期刊:
Magnesium technology
影响因子:
--
通讯作者:
Beyerlein, Irene J.
Beyerlein, Irene J.
中科院分区:
--
文献类型:
--
作者:
Arul Kumar, M.;Leu, Brandon;Rottmann, Paul;Beyerlein, Irene J.

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六方密堆积多晶中的孪晶通常在晶界 (GB) 处成核,传播到晶粒中并终止于相对的晶界处。通常,同一变体的多个平行孪晶会在同一晶粒内形成。当孪晶终止于晶粒内部而不是晶界时,它们往往会形成交错结构。无论是交错孪晶结构还是更常见的晶粒跨越孪晶结构形式都会极大地影响机械性能。在这项工作中,使用弹粘塑性快速傅立叶变换模型研究了交错孪晶形成的基本机制,该模型量化了与镁中不同配置的交错孪晶相关的局部应力。模型结果表明,当孪晶尖端靠近另一个孪晶的侧面时,孪晶传播的驱动力显着降低。结果,形成交错孪晶结构。
Twins in hexagonal close-packed polycrystals, most often nucleate at grain-boundaries (GBs), propagate into the grain and terminate at opposing GBs. Regularly, multiple parallel twins of the same variant form inside the same grain. When twins terminate inside the grains, rather than the grain boundary, they tend to form a staggered structure. Whether a staggered twin structure or the more common grain spanning twin structure forms can greatly affect mechanical behavior . In this work, the underlying mechanism for the formation of staggered twins is studied using an elasto-visco-plastic fast Fourier transform model, which quantifies the local stresses associated with-type staggered twins in magnesium for different configurations. The model results suggest that when a twin tip is close to the lateral side of another twin, the driving force for twin propagation is significantly reduced. As a result, the staggered twin structure forms.
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